3. Producción
Browse
18 results
Search Results
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Algal-based polysaccharides as polymer electrolytes in modern electrochemical energy conversion and storage systems: A review(Elsevier, 2020-12-19)In the last decade, the development of high-efficiency electrolytes based on polymeric materials has drawn increasing attention. Polysaccharides are widespread biopolymers with properties suitable for the fabrication of high-efficiency polymer electrolytes. In specific, algal-based polysaccharides are promising eco-friendly and biodegradable alternatives to conventional polymer electrolytes. This review focuses on the recent progress of polymer electrolytes based on algal polysaccharides. We set the basic consideration for high-performance polymer electrolytes and discuss the materials science aspects of algal-based polysaccharides involved. Then, we review the recent progress of algal polysaccharides-based electrolytes, including the various physical and chemical treatments applied for the enhancement of ionic conductivity and mechanical properties. Lastly, we summarize the applications of the algal polymer electrolytes in batteries, fuel cells, supercapacitors, and dye-sensitized solar cells and their performance. Algal polysaccharides are presented as biodegradable, cost-efficient, high-performance, and eco-friendly alternatives for the development of high-performance solid polymer electrolytes for modern electrochemical applications. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Bacterial-Polymer-Based Electrolytes: Recent Progress and Applications(American Chemical Society, 2020-12-28)Bacteria can naturally synthesize a wide range of biopolymers that have appealing material properties for numerous applications. In the past decade, the development of green electronics based on bacterial polymers has gained major attention. Polymer electrolytes are key components in electrochemical devices owing to their mechanical properties, thermal stability, and ionic conductivity. The present review focuses on the recent progress of bacterial-polymer-based electrolytes and their applications in electrochemical energy conversion and storage. First, we described the ion transfer mechanism of polymer electrolytes and the multiple approaches for improving ionic conductivity and mechanical properties. Then, we summarized the composition, performance, and approaches applied for the development of multiple bacterial polymer electrolytes, namely, polysaccharides, polyanhydrides, and polyesters. Lastly, the practical applications of bacterial-polymer-based electrolytes in electrochemical energy storage and conversion, namely, fuel cells, batteries, supercapacitors, and other electrochemicals, are reviewed. Bacterial polymer electrolytes are presented as a fruitful, eco-friendly, and high-performance alternative for traditional solid polymer electrolytes. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, - Some of the metrics are blocked by yourconsent settings
Item type:Publication, - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of the source of starch and plasticizers on the environmental burden of starch-Brazil nut fiber biocomposite production: A life cycle assessment approach(Elsevier, 2020-12-30)Amidst the global plastic pollution crisis, bio-based polymers have been proposed as a potential substitute to tackle this issue. Owed to their biodegradability, biopolymers are generally regarded as eco-friendly during the post-consumer (disposal) stage. However, the environmental burden of the many production processes biopolymers and their components undergo better reflect the sustainable nature of these materials. Previous studies evaluating the Life Cycle Assessment (LCA) of starch-based composites have focused on commercially available starches, although other non-conventional starches can also be used to produce biopolymers. To address this knowledge gap, in the present study we evaluated the LCA of starch-Brazil nut fiber biocomposites prepared with starch from three different sources, Andean potato, corn, and sweet potato, and applying two different plasticizers, glycerol and sorbitol. Results indicated that the starch-based biocomposites were less impacting than conventional PLA-Brazil nut fiber and PP-glass fiber composites. The type of starch and plasticizer significantly influenced the environmental load of the production of the composites. The main drivers of these differences were the multiple agricultural practices, such as irrigation and fertilization, and the crop efficiency for starch extraction. Sorbitol was found to be many times more impacting than glycerol in most categories, which is due to the complex processing of sorbitol and high content in biocomposites with similar mechanical properties than glycerol. Additionally, Brazil nut fibers are presented as an eco-friendly and low-burden natural filler due to their easy processing and agricultural waste origin. The limitations, applications, and significance of the results were discussed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Face mask waste generation and management during the COVID-19 pandemic: an overview and the Peruvian case(Elsevier, 2021-09-10)The ongoing COVID-19 pandemic has driven massive consumption of personal protective equipment (PPE) worldwide. Single-use face masks are one of the most used PPE to prevent the transmission of the virus. However, mismanagement of such materials threatens the environment with a new form of plastic pollution. Researchers argue that it is necessary to develop and implement innovative ways to manage and recycle PPE in order to reduce their impacts on the environment. In the present work, we have reviewed and discussed the recent development of sustainable face mask alternatives and recycling and repurposing routes under the COVID-19 pandemic context. Moreover, we have conducted estimations of the daily face mask waste generation in Peru, a developing country struggling with a poor solid waste management framework and infrastructure. Unlike previous studies, our equation incorporates the “economically active population” variable in order to provide more precise estimations, while evaluating single-use and reusable scenarios. The scenarios of incorporating reusable face masks significantly reduced the amount of solid waste generated in Peru. In situ evidence shows that face masks are polluting the streets and beaches of Peru, probably driven by mismanagement and poor environmental awareness. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Sustainable synthesis, reduction and applications of graphene obtained from renewable resources(Elsevier, 2021-09-01)Graphene is a revolutionary material with outstanding electrical, mechanical, thermal, and structural properties. The synthesis of graphene and its derivatives generally requires expensive and poisonous reagents. However, contemporary research efforts are switching towards more sustainable routes. The present review focused on the synthesis, performance, and applications of graphene-derived nanomaterials synthesized from waste biomass and reduced by green alternatives. Graphitization of waste carbon precursors is the most used method to obtain high purity graphite alternatives. Other methods, such as CVD, hydrothermal, laser, and CAS, have been investigated. Graphene yielded from biomass precursors exhibits properties similar to those from conventional sources. Green reduction of graphene oxide is carried out mostly by plant extracts from fruits, leaves, and other parts, which contain a high concentration of phenolic compounds. The as-prepared bio-waste and green-reduced graphene alternatives were applied in wastewater treatment, electrochemical storage devices, and metal ion sensors. In some cases, graphene showed significantly better performance than previous carbon-based nanomaterials reported in the literature. Despite being in its early stages of development, green-synthesized graphene has demonstrated great potential. As the interest in the development of sustainable alternatives continues to grow, future graphene research is expected to aim for this new line of research. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synthesis, characteristics, and applications of modified starch nanoparticles: a review(Elsevier, 2021-12-02) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Hydrogel-based triboelectric nanogenerators: properties, performance, and applications(Wiley, 2021-12-23)The development of triboelectric nanogenerators (TENGs) in 2012 revolutionized the vision of environmental energy harvesting. Nowadays, TENG assembly, working mode, and material selection are investigated continuously in order to obtain high-performance and long-lasting devices. Hydrogels are flexible and stretchable water-swollen 3D polymer networks, which can be tailored to conduct electricity and render outstanding mechanical properties. Hydrogels have been used to develop novel flexible wearable TENGs. Here, we review the current knowledge concerning hydrogel-based TENGs, including an overview of relevant hydrogel characteristics, hydrogel-based TENG performance, and their practical applications. The single-electrode TENG working mode is the most popular in hydrogel-based TENGs as they can be easily attached and stretched for biomechanical energy harvesting. Hydrogel-based TENGs have demonstrated to be capable of delivering high electrical output (250-400 V, ≥10 μA) and being robust enough for devices that last for several months. Biomechanical energy sensing and harvesting, smart farming, biomedical, and human–machine control interfaces are investigated as potential applications of hydrogel-based TENGs. Interestingly, energy harvesting from human motion is of particular interest for this type of TENG due to its outstanding stretchability, strength, and additional physical properties, such as self-healing ability. In most cases, the devices are capable of powering small electronics entirely from harvested biomechanical energy. Biomedical applications involved wound healing acceleration driven by TENG-powered electrical stimuli and disease monitoring, including implantable devices. Despite showing promising electrical performance, controlling water evaporation is still challenging to maintain the mechanical and conductive properties of hydrogel-based TENGs. On the other hand, fully biodegradable TENGs are largely unexplored, as well as many applications, such as blue energy harvesting, the internet of things, and others. The next steps in this line of research must focus on addressing the main challenges of hydrogel-based TENGs and filling the application knowledge gaps. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Environmental impact of peanut skin-reinforced native starch foams modified by acetylation(Wiley, 2021-05-13)Starch foams are natural and biodegradable alternatives proposed as sustainable replacements to expanded polystyrene. Despite being recognized as eco‐friendly materials, environmental impacts associated with their production process remain poorly studied. Here, the cradle‐to‐gate life‐cycle assessment of four types of starch‐based foams (potato, cassava, corn, and sweet potato) reinforced with peanut skin was assessed and analyzed. Chemically modifying starch by acetylation may accelerate the degradation ratio and decrease its hydrophilicity, which is a common issue in packaging applications. Hence, two starch scenarios were evaluated, considering as‐prepared and acetylated starches. The environmental burden of starch foam production varied depending on the starch source due to the different agricultural and irrigation practices. By incorporating 10 wt% of acetylated starch, the environmental impact drastically increased in most categories. Additionally, the sensitivity analysis carried out with different peanut skin contents showed a limited effect under 0–30 wt% of peanut skin, suggesting that peanut production exhibits a similar environmental burden to most starches.